Can you find out the missing number in the grid?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Count the number of lines in the image below ?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

What is both possible and impossible at the same time?

An old Woman left INR 33,333 to be divided equally among two fathers and two sons and each was to receive INR 11,111.
How was this possible?

A man died, leaving $10,000,000 for his widow, 5 sons and 4 daughters. Each daughter received an equal amount, each son received twice as much as a daughter, and the widow received three times as much as a son.

How much did the widow receive?

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?